Reduces visibility of internal fields/methods

Reduces the visibility of all fields to private and create setters/getters
when necessary. Exceptions are fields with GuiSync as these need to be
public.

Reduces the visibility of internal methods to private/protected/default when possible.

src/main/java/appeng/core/IMCHandler.java

@@ -75,7 +75,7 @@ public class IMCHandler
 	 *
 	 * @param event Event carrying the identifier and message for the handlers
 	 */
-	public void handleIMCEvent( final FMLInterModComms.IMCEvent event )
+	void handleIMCEvent( final FMLInterModComms.IMCEvent event )
 	{
 		for( final FMLInterModComms.IMCMessage message : event.getMessages() )
 		{